PESHAWAR (Agencies) - Five people were killed Saturday when a roadside bomb exploded in Swat, security officials said. The bomb, planted near a bridge in village Jano in Swat, went off when it was hit by a car, killing the driver and four others, one security official said. "It was a powerful blast, the car was badly damaged," said another official. Only two bodies have been identified so far, he said. One was a government contractor Rozi Khan, and the other was his driver Murad. Troops last year launched a major offensive against militants in the once-popular tourist site. The mountainous, snow-capped Swat region, renowned for its ancient Buddhist relics, used to attract large numbers of foreign and local tourists. But the valley has been turned into a battleground since radical cleric Maulana Fazlullah, who has links to Pakistan's Taliban movement, launched a violent campaign for the introduction of Sharia law. Two children and three militants were killed when troops shelled suspected Taliban and Al-Qaeda hideouts in Bajaur, officials said Saturday. Troops pounded a suspected hideout and killed three Afghan militants who were planning attacks on security forces in Khar, the main town in Bajaur tribal district, local official Haseeb Khan said. One mortar shell landed in a house near Khar, killing two children and wounding five other family members, he said. The shelling of suspected bases started overnight and continued into Saturday morning, officials said. Security forces have been engaged in fierce fighting with rebels in Bajaur since the launch of an army operation there in August. The military says more than 1,500 rebels have been killed and hundreds more have been captured since then. The latest incident came after Taliban militants attacked the house of a local Islamic scholar late Friday, sparking a gun battle that killed the man's brother and a Taliban commander, another official Mohammad Jamil said. The attackers accused the cleric of supporting the government, he said.